Load Balancer builder functions have too many args.

[Hoverbear]

It's not nice to use. :(

[wafflespeanut]

We could have a sub-builder for specific features. For example, we could do this for health checks,

let h = HealthProbe::tcp_port(80)     // or something similar (/me not great at naming)
    .unhealthy_threshold(3)
    .check_interval_seconds(5);
let l = LoadBalancer::create("foo", "nyc1")
    .with_probe(h);

WDYT?

[Hoverbear]

Hmmm, this seems reasonable. How can we prevent the user from thinking HealthProbe may have uses on its own?